Do we have to get Hongkong Transit visa when traveling to Canada?

Yes, you need to have a visit/transit type when transfering from HK to Canada.
After applying, it takes around 4 weeks to get it in the end, so you may not able to get it on Sunday or Saturday.

If you want to ask more question, you are suggested to consult the Immigration Department in HK and their phone number is (852) 2824 6111.

thanks Mindy